Exam 1
How many grams are there in 20.0 moles of gaseous N2O5?
2160g
How many mol of thionyl chloride (SOCl2) produce 15.0 g of sulfur dioxide? SOCl2 + H2O ---> SO2 + 2 HCl
0.234 mol
Gas A and B exert 0.5 mmHg and 0.4 mmHg of pressure, respectively. What is the mole fraction of gas A?
0.556
What is the mole percentage of “O” in the compound P4O10?
71.4%
How many grams of H2 do you obtain from the total reaction of 10.0 g of water? 2 H2O(g) ------> 2 H2(g) + O2(g
1.11g
Water and Vodka are mixed in equal amounts. What is the equilibrium temperature (TF) of this system if
vodka starts at 0°C, and water at 70°C? The Cvodka = 3.58 J/g°C
38ºC
What is the charge of the molybdenum (Mo) atom in the species “Mo2O3”? HINT: This species is not a peroxide
3
You need 50.0 mL of a solution 10% 𝑣/𝑣 of KBr from a stock 50% 𝑣/𝑣 solution. You need ____ mL of the stock solution
10.0mL
C1V1=C2V2
Obtain the heat of reaction ΔH3 of the following reaction using the Hess’s Law:
NO(g) + O(g) ---> NO2(g) ΔH3 = ?
NO(g) + O3(g) ---> NO2(g) + O2(g) ΔH1 = -198.9 KJ
2O3(g) ---> 2O2(g) + 2O(g) ΔH2 = +212 KJ
-305 KJ
528.13g
What is the formal charge of the phosphorus atom in the following hypothetical species? :P≡C-H
What is the energy produced by a photon of orange light? (λorange = 600 nm
3.31e-19 J
How many grams are there in 2.00 moles of the allotrope of carbon “fullerene” with the formula C60?
1440g
Balance:
C2H6 + O2 -> CO2 + H2O
2 , 7 , 4 , 6
What is the energy required to excite an electron of hydrogen from its ground state to energy level 3?
1.94 x 10-18 J